Microlife WatchBP 03 Mode D'emploi page 161

Mean arterial pressure (MAP): Defined as the average arterial pressure during a single
cardiac cycle. Oscillometric devices automatically measure the MAP and calculate the
systolic and diastolic pressure from there. For calculating the MAP from systolic and
diastolic BP the formula is as follows:
DP = diastolic pressure
SP = systolic pressure
Pulse Pressure (PP): Calculated with the formula:
SP = systolic pressure
DP = diastolic pressure
PP is a measure of the stiffness of the aorta and large arteries. Increased stiffness leads
to an increase in PP through a reduction in arterial compliance and effects on wave
reflection [11] PP has been recognized as an independent predictor of cardiovascular
risk in a hypertensive [12] and general population [13].
White coat window: The maximum reading in the first hour of ambulatory BP
measurement. As in this first hour the patient normally is in or has just left the hospital or
GP's practice, the BP values largely reflect the office BP measurement. The white coat
window has proven its clinical value for detection of the white coat effect and/or white
coat hypertension [14].
Diary: Highly recommended to any patient who undergoes 24h ambulatory BP
measurement. The actual awake and asleep periods should be based on this diary. With
the diary deviating BP values could be explained (i.e. patient has just had his meal, held
a siesta, was smoking or was watching a football match) and the time of
(antihypertensive) drug intake should be registered, which allows verification of the
effectiveness of the drug. For the latter, the WatchBP O3 device is equipped with a
button that should be pressed by the patient directly after antihypertensive drug intake.
1
MAP ≈ DP + / (SP-DP)
3
PP=SP-DP